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Ji J. U.^IUP,!^ 



PKEFATORY NOTE. 



In the act of Congress making appropriations for the Department 

 of Agriculture for the fiscal year ending June 30, 1889, provision was 

 made for botanical exploration and the collecting of plants in little 

 known districts of America in connection with the U. S. National 

 Herbarium ; and since that time a similar provision has been made 

 annually. As a partial result of this appropriation the Division of 

 Botany has issued heretofore two completed volumes, li and iv, of a 

 series of publications entitled Contributions from the U. S. National 

 Herbarium. The present volume, issued in nine parts, is made up 

 chiefly of reports on collections made by Dr. Edward Palmer in the 

 southwestern United States and adjacent portions of Mexico, together 

 with other collections made by agents of the Government. 



FkEDERICK V. COVILLE, 



Botanist, U. S. Department of Agriculture, 



Curator, U. S. National Herbarium. 



in 



